Transistorized driven power inverter utilizing base voltage clamping

Claim 1

A DRIVEN INVERTER COMPRISING A PAIR OF TRANSISTORS, EACH HAVING COLLECTOR, EMITTER AND BASE ELECTRODES, AN OUTPUT TRANSFORMER HAVING A CENTER TAPPED PRIMARY WINDING AND A SECONDARY WINDING, MEANS FOR CONNECTING A SOURCE OF DIRECT CURRENT IN SERIES WITH THE EMITTER-COLLECTOR CIRCUIT OF ONE SAID TRANSISTOR AND ONE SIDE OF SAID CENTER TAPPED PRIMARY WINDING, AND IN SERIES WITH THE EMITTER-COLLECTOR CIRCUIT OF THE OTHER OF SAID TRANSISTORS AND THE OTHER SIDE OF SAID CENTER TAPPED PRIMARY WINDING, AN INPUT TRANSFORMER HAVING A CENTER TAPPED SECONDARY WINDING, THE NUMBER OF TURNS OF EACH HALF OF SAID CENTER TAPPED SECONDARY WINDING BEING SELECTED TO PROVIDE APPROXIMATELY HALF THE FORWARD DRIVE VOLTAGE REQUIRED ACROSS THE BASE-EMITTER CIRCUIT OF SAID TRANSISTORS TO DRIVE THEM INTO SATURATION IN RESPONSE TO A SQUARE WAVE INPUT SIGNAL APPLIED TO A PRIMARY WINDING THEREOF, AN ANXILIARY TRANSFORMER HAVING A PRIMARY WINDING AND AT LEAST TWO SECONDARY WINDINGS OF EQUAL TURNS, MEANS FOR CONNECTING ONE OF SAID SECONDARY WINDINGS OF SAID AUXILIARY TRANSFORMER IN SERIES WITH ONE HALF OF SAID CENTER TAPPED SECONDARY WINDING AND THE BASE-EMITTER CIRCUIT OF ONE OF SAID TRANSISTORS, THE NUMBER OF TURNS AND SENSE OF SAID SECONDARY WINDING BEING SELECTED TO PROVIDE APPROXIMATELY HALF THE FORWARD DRIVE VOLTAGE REQUIRED ACROSS THE BASE-EMITTER CIRCUIT OF THE ONE OF SAID TRANSISTORS TO CAUSE IT TO CONDUCT AT SATURATION WHEN IT CONDUCTS COLLECTOR CURRENT, MEANS FOR CONNECTING THE OTHER OF SAID SECONDARY WINDINGS OF SAID AUXILIARY TRANSFORMER IN SERIES WITH THE OTHER HALF OF SAID CENTER TAPPED SECONDARY WINDING AND THE BASE-EMITTER CIRCUIT OF THE OTHER ONE OF SAID TRANSISTORS, THE NUMBER OF TURNS AND SENSE OF SAID SECONDARY WINDING BEING SELECTED TO PROVIDE APPROXIMATELY HALF THE FORWARD DRIVE VOLTAGE REQUIRED ACROSS THE BASE-EMITTER CIRCUIT OF THE OTHE ROF SAID TRANSISTORS TO CAUSE IT TO CONDUCT AT SATURTION WHEN IT CONDUCTS COLLECTOR CURRENT, AND A PAIR OF DIODES, EACH BEING CONNECTED IN PARALLEL WITH RESPECTIVE ONES OF SAID TWO SECONDARY WINDINGS OF SAID AUXILIARY TRANSFORMER, AND EACH BEING CONNECTED IN A DIRECTION FOR FORWARD CURRENT CONDUCTION IN A DIRECTION OPPOSITE THE FORWARD CURRENT CONDUCTION OF THE BASE-EMITTER JUNCTION OF ITS ASSOCIATED TRANSISTOR.